Does anybody know what they say an nv4500 transmission will hold up 2? I had mine rebuilt in late december and just shelled 3rd gear out again! Same thing happened last time shifted into 3rd gear and rolled into the throtle to build up speed and grrzgj bang no teeth or 3rd gear again! And on a side note how hard is it 2 swap in a 6spd? If ne body has done it and whats involved?